New Zealand First leader Winston Peters has delivered a slap down to one of the party's candidates after she promised to scrap the Waitangi Tribunal and remove all references to the Treaty of Waitangi from legislation.

Candidate Kym Koloni who's number 38 on the party list, reportedly made the comments at a meet the candidates event in Northcote on Auckland's North Shore last night.

She said NZ First is the only "colour-blind" party and it wants to scrap race-based policies and the Waitangi Tribunal, "remove Resource Management Act iwi clauses" and "remove all references to the Treaty of Waitangi from legislation".

Speed limits to increase to up to 100km/h near Auckland's Waterview Tunnel

Variable speed limits will be increased around Auckland's new Waterview Tunnel to allow maximum speeds of 100km/h.

Variable speed limits allow the speed limit to be changed depending on the traffic flow.

The New Zealand Transport Agency says variable speed limits will be extended on sections of State Highways 16 and 20 around the Waterview Tunnel to allow maximum speeds of 100km/h.

"We want to ensure that people's journeys on the motorway are as safe and easy as we can make them. Variable speeds are increasingly being used to match speed limits with the conditions and provide the right balance between safety and keeping traffic flowing smoothly," said Brett Gliddon, NZTA's System Design Manager.

Mr Gliddon said since opening the Waterview Tunnel NZTA has been monitoring the operational and safety performance on the state highways around the tunnel, as well as taking on board customer and stakeholder feedback.

"The motorway system around the tunnel and through the central motorway junction is complex with higher traffic volumes and a significant amount of lane changing and the speed limits need to reflect these conditions while also ensuring we keep motorists safe," he said.

Speed limits inside the tunnel will remain at 80km/h to manage the higher risks associated with an enclosed tunnel environment, Mr Gliddon said.

Additional physical infrastructure needs to be installed on the motorway system, and a legal process completed before the variable speed limits can be put in place, and that process is now underway, he said.

The $1.4 billion tunnel opened to traffic at the start of July following delays with the project.